Which of the following is a lyophilic colloid?

Relatively which conditions favour the faster Brownian movement of colloidal particles in solution?

Give information about Brownian movement.

When $FeCl_3$ is added to an excess of hot water,it gives a sol '$X$'. When $FeCl_3$ is added to $NaOH_{(aq)}$ solution,it gives a sol '$Y$'. The sols '$X$' and '$Y$' formed in the above processes respectively are:

Why do we add alum to purify water?

When the dispersion medium in a colloidal system is a gas,it is called ....